How to clear the error messages in the webdynpro java applications

Hi experts,

im having one question on webdynpro java application.

I wrote validation on some input field and it displays the error message if the input is wrong.

if I enter wrong input for the second time it displays the error message but the first error message is there and the second error message is displayed under the first error message.

now my question is, how can I clear these messages